Answer
We can see the graph of x versus t
$v_{ave} = 40~km/h$
Work Step by Step
We can see the graph of x versus t
We can calculate the average velocity as follows:
$v_{ave} = \frac{\Delta x}{\Delta t} = \frac{80~km}{2~h} = 40~km/h$
Note that the average velocity is the slope of the dotted blue line.
